230 lines
6.8 KiB
C
230 lines
6.8 KiB
C
/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "bsd_locl.h"
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RCSID("$Id: klogin.c,v 1.27 1999/10/04 16:11:48 bg Exp $");
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#ifdef KERBEROS
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#define VERIFY_SERVICE "rcmd"
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extern int notickets;
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extern char *krbtkfile_env;
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static char tkt_location[MaxPathLen];
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static int
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multiple_get_tkt(char *name,
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char *instance,
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char *realm,
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char *service,
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char *sinstance,
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int life,
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char *password)
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{
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int ret;
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int n;
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char rlm[256];
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/* First try to verify against the supplied realm. */
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ret = krb_get_pw_in_tkt(name, instance, realm, service, realm, life,
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password);
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if(ret == KSUCCESS)
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return KSUCCESS;
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/* Verify all local realms, except the supplied realm. */
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for (n = 1; krb_get_lrealm(rlm, n) == KSUCCESS; n++)
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if (strcmp(rlm, realm) != 0) {
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ret = krb_get_pw_in_tkt(name, instance, rlm,service, rlm,life, password);
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if (ret == KSUCCESS)
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return KSUCCESS;
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}
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return ret;
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}
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/*
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* Attempt to log the user in using Kerberos authentication
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*
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* return 0 on success (will be logged in)
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* 1 if Kerberos failed (try local password in login)
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*/
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int
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klogin(struct passwd *pw, char *instance, char *localhost, char *password)
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{
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int kerror;
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AUTH_DAT authdata;
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KTEXT_ST ticket;
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struct hostent *hp;
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u_int32_t faddr;
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char realm[REALM_SZ], savehost[MaxHostNameLen];
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extern int noticketsdontcomplain;
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#ifdef KLOGIN_PARANOID
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noticketsdontcomplain = 0; /* enable warning message */
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#endif
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/*
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* Root logins don't use Kerberos.
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* If we have a realm, try getting a ticket-granting ticket
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* and using it to authenticate. Otherwise, return
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* failure so that we can try the normal passwd file
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* for a password. If that's ok, log the user in
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* without issuing any tickets.
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*/
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if (strcmp(pw->pw_name, "root") == 0 ||
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krb_get_lrealm(realm, 1) != KSUCCESS)
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return (1);
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noticketsdontcomplain = 0; /* enable warning message */
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/*
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* get TGT for local realm
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* tickets are stored in a file named TKT_ROOT plus uid
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* except for user.root tickets.
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*/
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if (strcmp(instance, "root") != 0)
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snprintf(tkt_location, sizeof(tkt_location),
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"%s%u_%u",
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TKT_ROOT, (unsigned)pw->pw_uid, (unsigned)getpid());
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else {
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snprintf(tkt_location, sizeof(tkt_location),
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"%s_root_%d", TKT_ROOT,
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(unsigned)pw->pw_uid);
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}
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krbtkfile_env = tkt_location;
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krb_set_tkt_string(tkt_location);
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/*
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* Set real as well as effective ID to 0 for the moment,
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* to make the kerberos library do the right thing.
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*/
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if (setuid(0) < 0) {
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warnx("setuid");
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return (1);
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}
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/*
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* Get ticket
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*/
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kerror = multiple_get_tkt(pw->pw_name,
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instance,
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realm,
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KRB_TICKET_GRANTING_TICKET,
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realm,
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DEFAULT_TKT_LIFE,
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password);
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/*
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* If we got a TGT, get a local "rcmd" ticket and check it so as to
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* ensure that we are not talking to a bogus Kerberos server.
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*
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* There are 2 cases where we still allow a login:
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* 1: the VERIFY_SERVICE doesn't exist in the KDC
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* 2: local host has no srvtab, as (hopefully) indicated by a
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* return value of RD_AP_UNDEC from krb_rd_req().
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*/
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if (kerror != INTK_OK) {
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if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) {
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syslog(LOG_ERR, "Kerberos intkt error: %s",
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krb_get_err_text(kerror));
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dest_tkt();
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}
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return (1);
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}
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if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0)
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syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE);
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strlcpy(savehost, krb_get_phost(localhost), sizeof(savehost));
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#ifdef KLOGIN_PARANOID
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/*
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* if the "VERIFY_SERVICE" doesn't exist in the KDC for this host,
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* don't allow kerberos login, also log the error condition.
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*/
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kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33);
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if (kerror == KDC_PR_UNKNOWN) {
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syslog(LOG_NOTICE,
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"warning: TGT not verified (%s); %s.%s not registered, or srvtab is wrong?",
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krb_get_err_text(kerror), VERIFY_SERVICE, savehost);
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notickets = 0;
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return (1);
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}
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if (kerror != KSUCCESS) {
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warnx("unable to use TGT: (%s)", krb_get_err_text(kerror));
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syslog(LOG_NOTICE, "unable to use TGT: (%s)",
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krb_get_err_text(kerror));
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dest_tkt();
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return (1);
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}
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if (!(hp = gethostbyname(localhost))) {
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syslog(LOG_ERR, "couldn't get local host address");
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dest_tkt();
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return (1);
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}
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memcpy(&faddr, hp->h_addr, sizeof(faddr));
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kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr,
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&authdata, "");
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if (kerror == KSUCCESS) {
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notickets = 0;
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return (0);
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}
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/* undecipherable: probably didn't have a srvtab on the local host */
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if (kerror == RD_AP_UNDEC) {
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syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_get_err_text(kerror));
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dest_tkt();
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return (1);
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}
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/* failed for some other reason */
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warnx("unable to verify %s ticket: (%s)", VERIFY_SERVICE,
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krb_get_err_text(kerror));
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syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE,
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krb_get_err_text(kerror));
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dest_tkt();
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return (1);
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#else
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notickets = 0;
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return (0);
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#endif
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}
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#endif
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